Means for developing photographic plates.



Witnesses. /V\A//A%M v R. E. DE LURY. MEANS FOR DEVELOPING PHOTOGRAPHIC PLATES. APPLICATION FILED JUNE 6, 1908.

Patented May 4, 1909.

Inventor UNITED PATENT .OFFICE.

MEANS FOR DEVELOPING PHOTOGRAPHIC PLATES.

Specification of Letters Patent.

Patented May 4, 1909.

' Application filed-Tune s, 1908. Serial No. 437,157.

To all whomii may concern:

Be it known that I, RALPH EnisnsonDn LURY, a subject of the of Great Brita-in,

the following is a specification.

The invention relates to improvements in meansfor developing photographic plates, as described in the present specification, and

illustrated in the accompanying drawings that form part of the same.

'lhe invention consists essentially in the novel arrangement and construction of parts whereby means are provided for the admission of fluids to the photographic plate in the'p'late holder. without the admission of light thereto.

The object of the invention is to provide a means whereby photographic plates may be developed or otherwise treated in day light without removal from the holder in which they were exposed.

In thedrawings, Figure 1 is a sectional perspective view showing a plate holder containing a late and clamped to an outer frame for 'eveloping purposes. Fig. 2 is a sectional perspective vlew of the outer frame.

Like. numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, 1 a plate holder, preferably made of metal or other material unaffected by the chemicals used in the development of the .photographic plate. The holder l is' here shown with .the body portion 2 containing the plate 3, said plate,

eing suitably held in place by the sprin s 4, as customary in photographic plate hol ers.

5 is the frame extending around thebody portion 2 of' the holder, and having the inwardly-turned U-shaped flange 6 extending around said frame 5.

7 are grooves in the frame 5 across the top thereofland in which are inserted the bars 8 and 9, the bang being ca ped with a cloth strip 10 along the upper e ge thereof.

11 are springs inserted in the grooves 7 at the back of the bars 8 and 9, and pressing said bars upwardly against the flange 6 where it extends across the to of the frame 5, the

said frame being slotte at 12 along the top' thereof for the insertion of the regular opaque slide 13.

14 is an outer frame having the bottom thereor corresponding in shape to the late holder 1, and inca'sing the lower end o said plate holder. 15 are tests or indentations along the bottom of said casing and spacing said holder therefrom. 16 is an inwardlyturned U-shaped flange extending around said outer frame,-said frame being slotted along the top thereof at 17-. 18 is a groove along the top of said frame on the frontv side thereof, said groove havinga felt strip 19 inserted therein to close the recess between the flange- 16 and said outer frame along the top thereof. 20 is afelt strip inserted in a suitable groove along the top of said outer frame on the back thereof, and pressing against the top of the plate holder to revent the admission of light between sai( outer frame and said holder. l

'21 are spring clips projecting rearwardly from the sides of the outerframe 14, said clips springing behind the plate holder 1, and

securely holding the same against the outer frame 1 1.

is a transparent colored slide inserted through the slot 17 in the top of the outer frame 14, and sliding in the U-sha )ed recess formed by the flange 16, and completely covering in the plate holder 1 at thefront thereof.

To develop a plate in day light, after'it has been exposed in acamera, the holder containing the plate and having the regular opaque slide 13 covering the plate is placed in the outer frame 14 by fitting the bottom of the holder into the correspondingly formed bottom of the outer frame, and then springmg the top, of said holder between the clips on the sides of the outer'frame, so that said clips spring behind the holder and hold it in place. The slide 13 is then Withdrawn from the plate holder, leaving the transarent colored slide 22 protecting the plate from any injurious rays of light. The outer frame with the holder secured thereto is then immersed in a developing solution, the teats along the bottom of said outer frame spacing it from the holder, so that the developing solution may enter from the back around the bottom of the holder, and in over the top Where it will spread over the plate in the interior thereof, and develo the same, the transparent colored slide enabling the operator to determine when the plate is proplerlfy developed and ready for removal to t e IXlIl" solution.

What I claim as my invention is:

plates, a plate holder, an auxiliary frame tting thereover, and forming with said holder a tortuous fluid passage impenetrable to rays of light.

2. In means for developing photographic plates, a plate holder, an auxiliary frame aving an open front and fitting over said holder, said frame being spaced from said holder/at the bottom to form a tortuous fluid passage to the interior of said holdenand a transparent colored screen covering the opening in the front of said auxiliary frame. 3. In means for developing photographic lates, a plate holder, an auxiliar frame tting thereover the lower end of sald frame incasing the lower end of said holder and having a plurality of teats spacing said frame from said holder and an open front,

. spring clips secured to the sides of said casing and engaging said holder at the back thereof, and a transparent colored screen covering the front of said frame.

4. In means for developing photographic pl'lates, a plate holder, an auiriliai frame tting thereover and iucasing said holder at n the lower end thereof, and having a plurality of teats projectin therefrom and spacin said frame from said holder at the lower en thereof to form a tortuous passage around the bottom of said holder to the interior thereof, and an open front and a plurality of grooves extending along the top thereof,

spring clips secured to the side of said frame and engaging said holder at the back thereof, a transparent colored slide covering the front opening in said frame, and a plurality of felt strips inserted in said grooves.

Signed at the city of Ottawa, in the Province of Ontario, in the Dominion of Canada, this 22nd day of May, 1908.

RALPH EMERSON DE LURY. Witnesses:

LLOYD BLACKMORE, K. F. MAOGIBBON. 

